Birds of Celebes: Campophagidae. 
The plumage of G. hkohr appears to present another remarkable example 
jsee also Loncnhs, Iherococcyx crassirostris, Coradas etc.) of the influence of 
ight on the coloration. Seen from above with its wings naturally folded the 
male IS black, the female slate-grey, below both are white, the female havino- 
also the hroat and chest slate-grey as above. The lower back, rump and upper 
ai -coverts concealed by the wings, are white like the under surface. No stress 
would be laid upon this, were it not that the black tail-feathers are also white 
fbp^"^. by the tail-coverts. Further, the wings below, where 
y lest upon the sides of the body and rump, are white, while the free, more 
exposed ends of the quills are blackish grey. 
In Graucalus lencop^r^ius, it may however be added, the lining of the quills 
ut not the basal part of the tail-feathers, is white; in Artamus both are white' 
though expressed less well than in G. hicolor. Perhaps others will try an ex- 
planation of this obvious disposition of pigment. 
The bii-d seems to moult in August— September, no doubt after breeding 
out an immature bird killed in May is also moulting. 
* 155. GRAUCALUS LEUCOPYGIUS Bp. 
Celebesian Grey Cuckoo-shrike. 
Plate XXI. 
Graucalu^^ leucopygius (IJ Bp., Consp. 1850, I, ;i54; (2) Hartl., J. f. O. 1864, 443; (3) 
TJ ^ Salvad,, Ann. Mus. Civ. Gen. 1875, VH, 657- 
\ J i-uggem., Abh. Ver. Bremen 1876, V, 71; (6) Lenz, J. f. O. 1877, 374- (?] 
larpe, Mitth. Z. Mus. Dresden 1878, ID, 365; (8) id., Cat. B. IV, 1879, 33;’ (9) 
Meyer, Ibis 1879, 129, 146; (10) AV. Bias., J. f. O. 1883, 137; (11) Meyer, Isis 
8^88^ W.Blas., Ztschr. ges. Orn. 1885, 280; (13) Guillem., P. z! 
(Xvi Tristr., Cat. Coll B. 1889, 185; 
W.l '"■ I, 1892, 40, pi. CLXVI; (17) Buttik., Zool Erg 
Vebers Reise Qst-Ind. 1893, ID, 278; (18) M. & Wg., Abh. Mus. Dresden 
Hnrt V’ C '/ •’ 1896, Nr. 2, p. 14; (21) 
Hart., Nov. Zool. 1896, 156; (22) id., ib 1897, 158, 162. 
«. Campephaga leucopygia (1) Finscb, Neu Guinea 1866, 172; (2) Gray, HL 1869 I 
336, Nr. 5074; (3) Rosenb., Mal'Archip. 1878, 273. 
ft^Coraeina leucopygia (1) Heine & Rchw., Nomencl. Mus. Hein. 1890, 69. 
Maspas besar”, Minahassa, Nat. Coll. 
“Burong mima”, Malay, Minahassa, Meyer 9, Nat. Coll. 
Hickson, Nat. m N. Celebes 1889, 91. 
Laveda , Tjainba Distr., S. Celebes, Platen 12. 
‘•Sosolat daka”, Tonkean, E. Celebes, Nat. Coll. 
Figure •“.*», and ae,mptl„„. Meyer .YFI; HartUul, 2, Brilggemann 5 (j„u„gj; 
1 , W. Blasius 12 (sexual differences). 
Adult [male]. General colour light slate-grey, slightly tinged with olive-grey, becoming white 
on rump and upper tail-coverts; wings and tail black, the mid^ tail-feSs and 
the vung-coverts washed with slate-grey, the quills edged with the same colour or a 
